Storage-stable suspension of tougheners in epoxy resin hardeners

Abstract

Storage-stable suspension comprised of a solid or liquid epoxy resin hardener and a solid or liquid toughener suspended therein is distinguished by excellent homogeneous dispersion of the toughener in the epoxy resin hardener and are suitable for preparing suspensions of curable epoxy resin compositions.

What is claimed is: 
     
       1. A storage-stable suspension consisting of a solid or liquid epoxy resin hardener and homogeneously dispersed therein particles of a toughener which does not contain groups that react with the hardener wherein the suspension is subsequently mixed with an epoxy resin. 
     
     
       2. A suspension according to claim 1, which comprises a liquid epoxy resin hardener. 
     
     
       3. A suspension according to claim 1, wherein the epoxy resin hardener is a polycarboxylic anhydride or a polyamine. 
     
     
       4. A suspension according to claim 3, which comprises a liquid polycarboxylic anhydride or a liquid polyamine. 
     
     
       5. A suspension according to claim 1, wherein the solid toughener is a graft polymer. 
     
     
       6. A suspension according to claim 1, wherein the solid toughener is a graft polymer. 
     
     
       7. A suspension according to claim 5, wherein the graft polymer is a core/shell polymer.